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volume lists christmas ellipses people maths pentagons range consecutive numbers probabilty ave probability hexagons geometric mean cryptic crossnumbers angles square roots matrices tangents cryptic clues prime factors the only crossnumber 2d shapes unit fractions 3d shapes folding tube maps clocks prime numbers games crossnumbers chalkdust crossnumber medians partitions geometry triangle numbers division sums planes surds factorials numbers even numbers axes tournaments neighbours dates dodecagons spheres squares triangles books circles dice albgebra cubics cube numbers consecutive integers averages star numbers shape xor algebra routes addition sport determinants digits percentages bases multiples crosswords tiling multiplication indices lines coordinates square numbers expansions graphs regular shapes binary integration chocolate logic digital clocks quadrilaterals perimeter odd numbers calculus number gerrymandering elections floors money functions advent sets square grids doubling time decahedra sum to infinity trigonometry taxicab geometry remainders parabolas median irreducible numbers grids polynomials colouring chess speed geometric means area factors products symmetry scales perfect numbers palindromes cards complex numbers rugby menace mean integers rectangles powers proportion arrows polygons multiplaction squares fractions combinatorics coins quadratics means differentiation digital products sequences dominos pascal's triangle wordplay shapes balancing